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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-12646" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-65b48375-3912-42e9-9322-fd476ecc9ba4" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12646" style="color: #3b73af; text-decoration: none">HHH-12646</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-12646" style="color: #3b73af; text-decoration: none">Make the order of exposed metadata independent of the execution environment</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-65b48375-3912-42e9-9322-fd476ecc9ba4" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"> Improvement </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.3.1 </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Assignee:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 29/May/2018 03:22 AM </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Fix Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 6.0.0.Alpha1 </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-minor-82084651-542c-4712-ab3b-355ee5528c12" height="16" width="16" border="0" align="absmiddle" alt="Minor" style="vertical-align: text-bottom"> Minor </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Reporter:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="yrodiere" id="email_yrodiere" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=yrodiere" style="color:#6c797f;; color: #3b73af; text-decoration: none">Yoann Rodière</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">Currently most of the metadata exposed by ORM (through the <tt>Metadata</tt> class in particular) is stored in {{HashMap}}s and {{HashSet}}s. As a result, user code or external integration code based on this metadata may behave differently from one execution to another.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">For example if two entities are configured incorrectly in Hibernate Search, during one execution the error would be detected (and thrown) on "entity1" first, and during the next execution the error would be detected on "entity2" first. Which would give the impression of random behavior to the user.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Of course users and integrators could, in most cases, sort the metadata before processing it in order to avoid the issue (see <span class="jira-issue-macro" data-jira-key="HSEARCH-3182"> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3182" class="jira-issue-macro-key issue-link" title="Sort Hibernate ORM metadata before processing it" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12150&avatarType=issuetype"> HSEARCH-3182 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-complete jira-macro-single-issue-export-pdf" style="background: #cccccc; border: 1px solid #cccccc; border-radius: 3px; color: #333333; display: inline-block; font-size: 11px; font-weight: bold; line-height: 99%; margin: 0; padding: 2px 5px; text-align: center; text-decoration: none; text-transform: uppercase; background-color: #ffffff; border-color: #cccccc; color: #333333" bgcolor="#ffffff">Open</span> </span> ). But a probably better solution would be for ORM to use a reproducible order to begin with, for example by using <tt>LinkedHashMap</tt> and <tt>LinkedHashSet</tt>, or even <tt>TreeMap</tt> and <tt>TreeSet</tt> if necessary.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Hibernate Search is impacted in particular by:</p>
<ul>
<li>The order of persistent classes in <tt>org.hibernate.boot.Metadata#getEntityBindings</tt>. The order of this collection has been verified to be unstable from one execution to another</li>
<li>The order of properties in <tt>org.hibernate.mapping.PersistentClass#getPropertyIterator</tt>. The order of this collection may be stable from one execution to another, but we should check that.</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">... but there are plenty of other metadata maps which may impact someone else.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">It might be a good idea to wait for ORM 6 before fixing this, especially if metadata changes a lot in that version: the patch will probably be a bit hard to port...</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Note: I could not find an existing ticket for this problem with the following query: <tt>project = HHH and text ~ 'order' and text ~ 'metadata' order by lastViewed DESC</tt></p> </td>
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